Rais
abbr. 辐射源监管信息系统；红外反射-吸收光谱学（Reflection-Absorption Infrared Spectroscopy）
🗣️ 情景例句
I can assure you that as long as you stay at home, you're safe.
我可向你保证，只要你呆在家里就会很安全。
Well done!
干得好！
How do you do?
您好。